Capacitance values in peavey amp

[treguiers]

Hi Everyone,
Working on the Peavey Classic 30 tube amp. Pulled up the schematic, but values that's given for the cpacitors are like 22A25. What is that in Farads. Heres a copy of the schematic. Again any help would be most welcome

T


www.blueguitar.org/new/schem/peavey/c30schem.gif

[sumgai]

tre,

Looking at the schematic, and where the cap is placed (I stopped looking after finding the first one....), I can say with some authority that the cap is a 22µfd, 25WVDC* unit. The 'A' refers to the tolerance range of the device, which translates to 20%, give or take.

The capacitance value here isn't critical, but the final tonality will change somewhat, if you should feel the need to experiment (like a True Nutz!). However, the voltage value should not be reduced. Higher is OK, lower is asking for trouble, safety-wise.

HTH




sumgai

* Sometimes you'll see the voltage rating as "vDC" or just "v", but it always refers to a DC voltage. The "W" means 'working', as in, the voltage at which the component is designed to work. This is a normal expression of an electrolytical cap's value(s).


(EDITed to change the cap's value, an error found by treguitars, and noted below.)

[treguiers]

Sumgai,
As always, a fountain of knowledge.
Take care,
E

[treguiers]

sorry sumgai,
but why 0.022uf, surely 22a25 is 22uf. would 0.022uf not be 0.022a25?
going ordering caps soon(I think the biasing caps need changing)

thanks

[sumgai]

tre,

It would seem that I must have been sleeping that night, you caught me out.

Fender usually uses a 25µfd unit in that position, whereas Marshall likes a 0.68µfd unit (non-electrolytic) - go figure.

I've revised my post above, with reference to your post following, so that no one gets the wrong idea, before reading the whole thread. Thanks.



sumgai